﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 using System.Data;
 using System.Xml;
 using System.Data.SqlClient;
 using System.Collections;
 
 
 namespace BLL
 {
     /// <summary>
     /// The SqlHelper class is intended to encapsulate high performance, scalable best practices for 
     /// common uses of SqlClient
     /// </summary>
     public sealed class SqlHelper
     {
         #region private utility methods & constructors
 
         // Since this class provides only static methods, make the default constructor private to prevent 
         // instances from being created with "new SqlHelper()"
         private SqlHelper() {}
 
         /// <summary>
         /// This method is used to attach array of SqlParameters to a SqlCommand.
         /// 
         /// This method will assign a value of DbNull to any parameter with a direction of
         /// InputOutput and a value of null.  
         /// 
         /// This behavior will prevent default values from being used, but
         /// this will be the less common case than an intended pure output parameter (derived as InputOutput)
         /// where the user provided no input value.
         /// </summary>
         /// <param name="command">The command to which the parameters will be added</param>
         /// <param name="commandParameters">An array of SqlParameters to be added to command</param>
         private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
         {
             if( command == null ) throw new ArgumentNullException( "command" );
             if( commandParameters != null )
             {
                 foreach (SqlParameter p in commandParameters)
                 {
                     if( p != null )
                     {
                         // Check for derived output value with no value assigned
                         if ( ( p.Direction == ParameterDirection.InputOutput || 
                             p.Direction == ParameterDirection.Input ) && 
                             (p.Value == null))
                         {
                             p.Value = DBNull.Value;
                         }
                         command.Parameters.Add(p);
                     }
                 }
             }
         }
 
         /// <summary>
         /// This method assigns dataRow column values to an array of SqlParameters
         /// </summary>
         /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values</param>
         private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)
         {
             if ((commandParameters == null) || (dataRow == null)) 
             {
                 // Do nothing if we get no data
                 return;
             }
 
             int i = 0;
             // Set the parameters values
             foreach(SqlParameter commandParameter in commandParameters)
             {
                 // Check the parameter name
                 if( commandParameter.ParameterName == null || 
                     commandParameter.ParameterName.Length <= 1 )
                     throw new Exception( 
                         string.Format( 
                             "Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.", 
                             i, commandParameter.ParameterName ) );
                 if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)
                     commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
                 i++;
             }
         }
 
         /// <summary>
         /// This method assigns an array of values to an array of SqlParameters
         /// </summary>
         /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>
         /// <param name="parameterValues">Array of objects holding the values to be assigned</param>
         private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)
         {
             if ((commandParameters == null) || (parameterValues == null)) 
             {
                 // Do nothing if we get no data
                 return;
             }
 
             // We must have the same number of values as we pave parameters to put them in
             if (commandParameters.Length != parameterValues.Length)
             {
                 throw new ArgumentException("Parameter count does not match Parameter Value count.");
             }
 
             // Iterate through the SqlParameters, assigning the values from the corresponding position in the 
             // value array
             for (int i = 0, j = commandParameters.Length; i < j; i++)
             {
                 // If the current array value derives from IDbDataParameter, then assign its Value property
                 if (parameterValues[i] is IDbDataParameter)
                 {
                     IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
                     if( paramInstance.Value == null )
                     {
                         commandParameters[i].Value = DBNull.Value; 
                     }
                     else
                     {
                         commandParameters[i].Value = paramInstance.Value;
                     }
                 }
                 else if (parameterValues[i] == null)
                 {
                     commandParameters[i].Value = DBNull.Value;
                 }
                 else
                 {
                     commandParameters[i].Value = parameterValues[i];
                 }
             }
         }
 
         /// <summary>
         /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters 
         /// to the provided command
         /// </summary>
         /// <param name="command">The SqlCommand to be prepared</param>
         /// <param name="connection">A valid SqlConnection, on which to execute this command</param>
         /// <param name="transaction">A valid SqlTransaction, or 'null'</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
         /// <param name="mustCloseConnection"><c>true</c> if the connection was opened by the method, otherwose is false.</param>
         private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection )
         {
             if( command == null ) throw new ArgumentNullException( "command" );
             if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );
 
             // If the provided connection is not open, we will open it
             if (connection.State != ConnectionState.Open)
             {
                 mustCloseConnection = true;
                 connection.Open();
             }
             else
             {
                 mustCloseConnection = false;
             }
 
             // Associate the connection with the command
             command.Connection = connection;
 
             // Set the command text (stored procedure name or SQL statement)
             command.CommandText = commandText;
 
             // If we were provided a transaction, assign it
             if (transaction != null)
             {
                 if( transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
                 command.Transaction = transaction;
             }
 
             // Set the command type
             command.CommandType = commandType;
 
             // Attach the command parameters if they are provided
             if (commandParameters != null)
             {
                 AttachParameters(command, commandParameters);
             }
             return;
         }
 
         #endregion private utility methods & constructors
 
         #region ExecuteNonQuery
 
         /// <summary>
         /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in 
         /// the connection string
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>An int representing the number of rows affected by the command</returns>
         public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string 
         /// using the provided parameters
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>An int representing the number of rows affected by the command</returns>
         public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
 
             // Create & open a SqlConnection, and dispose of it after we are done
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();
 
                 // Call the overload that takes a connection in place of the connection string
                 return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
             }
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in 
         /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="spName">The name of the stored prcedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>An int representing the number of rows affected by the command</returns>
         public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlConnection. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>An int representing the number of rows affected by the command</returns>
         public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns no resultset) against the specified SqlConnection 
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>An int representing the number of rows affected by the command</returns>
         public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {    
             if( connection == null ) throw new ArgumentNullException( "connection" );
 
             // Create a command and prepare it for execution
             SqlCommand cmd = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
             
             // Finally, execute the command
             int retval = cmd.ExecuteNonQuery();
             
             // Detach the SqlParameters from the command object, so they can be used again
             cmd.Parameters.Clear();
             if( mustCloseConnection )
                 connection.Close();
             return retval;
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection 
         /// using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>An int representing the number of rows affected by the command</returns>
         public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>An int representing the number of rows affected by the command</returns>
         public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>An int representing the number of rows affected by the command</returns>
         public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
 
             // Create a command and prepare it for execution
             SqlCommand cmd = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
                 
             // Finally, execute the command
             int retval = cmd.ExecuteNonQuery();
                 
             // Detach the SqlParameters from the command object, so they can be used again
             cmd.Parameters.Clear();
             return retval;
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified 
         /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>An int representing the number of rows affected by the command</returns>
         public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
             }
         }
 
         #endregion ExecuteNonQuery
 
         #region ExecuteDataset
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
         /// the connection string. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
 
             // Create & open a SqlConnection, and dispose of it after we are done
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();
 
                 // Call the overload that takes a connection in place of the connection string
                 return ExecuteDataset(connection, commandType, commandText, commandParameters);
             }
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
         /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
             
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);
         }
         
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
 
             // Create a command and prepare it for execution
             SqlCommand cmd = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
                 
             // Create the DataAdapter & DataSet
             using( SqlDataAdapter da = new SqlDataAdapter(cmd) )
             {
                 DataSet ds = new DataSet();
 
                 // Fill the DataSet using default values for DataTable names, etc
                 da.Fill(ds);
                 
                 // Detach the SqlParameters from the command object, so they can be used again
                 cmd.Parameters.Clear();
 
                 if( mustCloseConnection )
                     connection.Close();
 
                 // Return the dataset
                 return ds;
             }    
         }
         
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
         /// using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);
         }
         
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
 
             // Create a command and prepare it for execution
             SqlCommand cmd = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
                 
             // Create the DataAdapter & DataSet
             using( SqlDataAdapter da = new SqlDataAdapter(cmd) )
             {
                 DataSet ds = new DataSet();
 
                 // Fill the DataSet using default values for DataTable names, etc
                 da.Fill(ds);
                 
                 // Detach the SqlParameters from the command object, so they can be used again
                 cmd.Parameters.Clear();
 
                 // Return the dataset
                 return ds;
             }    
         }
         
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 
         /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
             
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
             }
         }
 
         #endregion ExecuteDataset
         
         #region ExecuteReader
 
         /// <summary>
         /// This enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that
         /// we can set the appropriate CommandBehavior when calling ExecuteReader()
         /// </summary>
         private enum SqlConnectionOwnership    
         {
             /// <summary>Connection is owned and managed by SqlHelper</summary>
             Internal, 
             /// <summary>Connection is owned and managed by the caller</summary>
             External
         }
 
         /// <summary>
         /// Create and prepare a SqlCommand, and call ExecuteReader with the appropriate CommandBehavior.
         /// </summary>
         /// <remarks>
         /// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
         /// 
         /// If the caller provided the connection, we want to leave it to them to manage.
         /// </remarks>
         /// <param name="connection">A valid SqlConnection, on which to execute this command</param>
         /// <param name="transaction">A valid SqlTransaction, or 'null'</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
         /// <param name="connectionOwnership">Indicates whether the connection parameter was provided by the caller, or created by SqlHelper</param>
         /// <returns>SqlDataReader containing the results of the command</returns>
         private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
         {    
             if( connection == null ) throw new ArgumentNullException( "connection" );
 
             bool mustCloseConnection = false;
             // Create a command and prepare it for execution
             SqlCommand cmd = new SqlCommand();
             try
             {
                 PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
             
                 // Create a reader
                 SqlDataReader dataReader;
 
                 // Call ExecuteReader with the appropriate CommandBehavior
                 if (connectionOwnership == SqlConnectionOwnership.External)
                 {
                     dataReader = cmd.ExecuteReader();
                 }
                 else
                 {
                     dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                 }
             
                 // Detach the SqlParameters from the command object, so they can be used again.
                 // HACK: There is a problem here, the output parameter values are fletched 
                 // when the reader is closed, so if the parameters are detached from the command
                 // then the SqlReader can磘 set its values. 
                 // When this happen, the parameters can磘 be used again in other command.
                 bool canClear = true;
                 foreach(SqlParameter commandParameter in cmd.Parameters)
                 {
                     if (commandParameter.Direction != ParameterDirection.Input)
                         canClear = false;
                 }
             
                 if (canClear)
                 {
                     cmd.Parameters.Clear();
                 }
 
                 return dataReader;
             }
             catch
             {
                 if( mustCloseConnection )
                     connection.Close();
                 throw;
             }
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
         /// the connection string. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
         public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
         public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             SqlConnection connection = null;
             try
             {
                 connection = new SqlConnection(connectionString);
                 connection.Open();
 
                 // Call the private overload that takes an internally owned connection in place of the connection string
                 return ExecuteReader(connection, null, commandType, commandText, commandParameters,SqlConnectionOwnership.Internal);
             }
             catch
             {
                 // If we fail to return the SqlDatReader, we need to close the connection ourselves
                 if( connection != null ) connection.Close();
                 throw;
             }
             
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
         /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
         public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
             
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                 AssignParameterValues(commandParameters, parameterValues);
 
                 return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
         public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
         public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             // Pass through the call to the private overload using a null transaction value and an externally owned connection
             return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
         /// using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
         public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
 
                 AssignParameterValues(commandParameters, parameterValues);
 
                 return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteReader(connection, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
         public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
         public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
 
             // Pass through to private overload, indicating that the connection is owned by the caller
             return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified
         /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
         public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
 
                 AssignParameterValues(commandParameters, parameterValues);
 
                 return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
             }
         }
 
         #endregion ExecuteReader
 
         #region ExecuteScalar
         
         /// <summary>
         /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in 
         /// the connection string. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
         public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string 
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
         public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             // Create & open a SqlConnection, and dispose of it after we are done
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();
 
                 // Call the overload that takes a connection in place of the connection string
                 return ExecuteScalar(connection, commandType, commandText, commandParameters);
             }
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in 
         /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
         public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
             
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
         public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
         public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
 
             // Create a command and prepare it for execution
             SqlCommand cmd = new SqlCommand();
 
             bool mustCloseConnection = false;
             PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
                 
             // Execute the command & return the results
             object retval = cmd.ExecuteScalar();
                 
             // Detach the SqlParameters from the command object, so they can be used again
             cmd.Parameters.Clear();
 
             if( mustCloseConnection )
                 connection.Close();
 
             return retval;
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
         /// using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
         public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlTransaction. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
         public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
         public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
 
             // Create a command and prepare it for execution
             SqlCommand cmd = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
                 
             // Execute the command & return the results
             object retval = cmd.ExecuteScalar();
                 
             // Detach the SqlParameters from the command object, so they can be used again
             cmd.Parameters.Clear();
             return retval;
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified
         /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
         public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // PPull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
             }
         }
 
         #endregion ExecuteScalar    
 
         #region ExecuteXmlReader
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
         /// <returns>An XmlReader containing the resultset generated by the command</returns>
         public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>An XmlReader containing the resultset generated by the command</returns>
         public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
 
             bool mustCloseConnection = false;
             // Create a command and prepare it for execution
             SqlCommand cmd = new SqlCommand();
             try
             {
                 PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
             
                 // Create the DataAdapter & DataSet
                 XmlReader retval = cmd.ExecuteXmlReader();
             
                 // Detach the SqlParameters from the command object, so they can be used again
                 cmd.Parameters.Clear();
 
                 return retval;
             }
             catch
             {    
                 if( mustCloseConnection )
                     connection.Close();
                 throw;
             }
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
         /// using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="spName">The name of the stored procedure using "FOR XML AUTO"</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>An XmlReader containing the resultset generated by the command</returns>
         public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
         /// <returns>An XmlReader containing the resultset generated by the command</returns>
         public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
         {
             // Pass through the call providing null for the set of SqlParameters
             return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <returns>An XmlReader containing the resultset generated by the command</returns>
         public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
 
             // Create a command and prepare it for execution
             SqlCommand cmd = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
             
             // Create the DataAdapter & DataSet
             XmlReader retval = cmd.ExecuteXmlReader();
             
             // Detach the SqlParameters from the command object, so they can be used again
             cmd.Parameters.Clear();
             return retval;            
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 
         /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
             }
         }
 
         #endregion ExecuteXmlReader
 
         #region FillDataset
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
         /// the connection string. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
         /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
         /// by a user defined name (probably the actual table name)</param>
         public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
             
             // Create & open a SqlConnection, and dispose of it after we are done
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();
 
                 // Call the overload that takes a connection in place of the connection string
                 FillDataset(connection, commandType, commandText, dataSet, tableNames);
             }
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
         /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
         /// by a user defined name (probably the actual table name)
         /// </param>
         public static void FillDataset(string connectionString, CommandType commandType,
             string commandText, DataSet dataSet, string[] tableNames,
             params SqlParameter[] commandParameters)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
             // Create & open a SqlConnection, and dispose of it after we are done
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();
 
                 // Call the overload that takes a connection in place of the connection string
                 FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
             }
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
         /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
         /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
         /// by a user defined name (probably the actual table name)
         /// </param>    
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         public static void FillDataset(string connectionString, string spName,
             DataSet dataSet, string[] tableNames,
             params object[] parameterValues)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
             // Create & open a SqlConnection, and dispose of it after we are done
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();
 
                 // Call the overload that takes a connection in place of the connection string
                 FillDataset (connection, spName, dataSet, tableNames, parameterValues);
             }
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
         /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
         /// by a user defined name (probably the actual table name)
         /// </param>    
         public static void FillDataset(SqlConnection connection, CommandType commandType, 
             string commandText, DataSet dataSet, string[] tableNames)
         {
             FillDataset(connection, commandType, commandText, dataSet, tableNames, null);
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
         /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
         /// by a user defined name (probably the actual table name)
         /// </param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         public static void FillDataset(SqlConnection connection, CommandType commandType, 
             string commandText, DataSet dataSet, string[] tableNames,
             params SqlParameter[] commandParameters)
         {
             FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
         /// using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
         /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
         /// by a user defined name (probably the actual table name)
         /// </param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         public static void FillDataset(SqlConnection connection, string spName, 
             DataSet dataSet, string[] tableNames,
             params object[] parameterValues)
         {
             if ( connection == null ) throw new ArgumentNullException( "connection" );
             if (dataSet == null ) throw new ArgumentNullException( "dataSet" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
             }    
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
         /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
         /// by a user defined name (probably the actual table name)
         /// </param>
         public static void FillDataset(SqlTransaction transaction, CommandType commandType, 
             string commandText,
             DataSet dataSet, string[] tableNames)
         {
             FillDataset (transaction, commandType, commandText, dataSet, tableNames, null);    
         }
 
         /// <summary>
         /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
         /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
         /// by a user defined name (probably the actual table name)
         /// </param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         public static void FillDataset(SqlTransaction transaction, CommandType commandType, 
             string commandText, DataSet dataSet, string[] tableNames,
             params SqlParameter[] commandParameters)
         {
             FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 
         /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <remarks>
         /// This method provides no access to output parameters or the stored procedure's return value parameter.
         /// 
         /// e.g.:  
         ///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);
         /// </remarks>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
         /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
         /// by a user defined name (probably the actual table name)
         /// </param>
         /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
         public static void FillDataset(SqlTransaction transaction, string spName,
             DataSet dataSet, string[] tableNames,
             params object[] parameterValues) 
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
             if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If we receive parameter values, we need to figure out where they go
             if ((parameterValues != null) && (parameterValues.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
 
                 // Assign the provided values to these parameters based on parameter order
                 AssignParameterValues(commandParameters, parameterValues);
 
                 // Call the overload that takes an array of SqlParameters
                 FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
             }
             else 
             {
                 // Otherwise we can just call the SP without params
                 FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
             }    
         }
 
         /// <summary>
         /// Private helper method that execute a SqlCommand (that returns a resultset) against the specified SqlTransaction and SqlConnection
         /// using the provided parameters.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">A valid SqlConnection</param>
         /// <param name="transaction">A valid SqlTransaction</param>
         /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
         /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
         /// by a user defined name (probably the actual table name)
         /// </param>
         /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
         private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType, 
             string commandText, DataSet dataSet, string[] tableNames,
             params SqlParameter[] commandParameters)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
 
             // Create a command and prepare it for execution
             SqlCommand command = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
                 
             // Create the DataAdapter & DataSet
             using( SqlDataAdapter dataAdapter = new SqlDataAdapter(command) )
             {
                 
                 // Add the table mappings specified by the user
                 if (tableNames != null && tableNames.Length > 0)
                 {
                     string tableName = "Table";
                     for (int index=0; index < tableNames.Length; index++)
                     {
                         if( tableNames[index] == null || tableNames[index].Length == 0 ) throw new ArgumentException( "The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames" );
                         dataAdapter.TableMappings.Add(tableName, tableNames[index]);
                         tableName += (index + 1).ToString();
                     }
                 }
                 
                 // Fill the DataSet using default values for DataTable names, etc
                 dataAdapter.Fill(dataSet);
 
                 // Detach the SqlParameters from the command object, so they can be used again
                 command.Parameters.Clear();
             }
 
             if( mustCloseConnection )
                 connection.Close();
         }
         #endregion
         
         #region UpdateDataset
         /// <summary>
         /// Executes the respective command for each inserted, updated, or deleted row in the DataSet.
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
         /// </remarks>
         /// <param name="insertCommand">A valid transact-SQL statement or stored procedure to insert new records into the data source</param>
         /// <param name="deleteCommand">A valid transact-SQL statement or stored procedure to delete records from the data source</param>
         /// <param name="updateCommand">A valid transact-SQL statement or stored procedure used to update records in the data source</param>
         /// <param name="dataSet">The DataSet used to update the data source</param>
         /// <param name="tableName">The DataTable used to update the data source.</param>
         public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)
         {
             if( insertCommand == null ) throw new ArgumentNullException( "insertCommand" );
             if( deleteCommand == null ) throw new ArgumentNullException( "deleteCommand" );
             if( updateCommand == null ) throw new ArgumentNullException( "updateCommand" );
             if( tableName == null || tableName.Length == 0 ) throw new ArgumentNullException( "tableName" ); 
 
             // Create a SqlDataAdapter, and dispose of it after we are done
             using (SqlDataAdapter dataAdapter = new SqlDataAdapter())
             {
                 // Set the data adapter commands
                 dataAdapter.UpdateCommand = updateCommand;
                 dataAdapter.InsertCommand = insertCommand;
                 dataAdapter.DeleteCommand = deleteCommand;
 
                 // Update the dataset changes in the data source
                 dataAdapter.Update (dataSet, tableName); 
 
                 // Commit all the changes made to the DataSet
                 dataSet.AcceptChanges();
             }
         }
         #endregion
 
         #region CreateCommand
         /// <summary>
         /// Simplify the creation of a Sql command object by allowing
         /// a stored procedure and optional parameters to be provided
         /// </summary>
         /// <remarks>
         /// e.g.:  
         ///  SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
         /// </remarks>
         /// <param name="connection">A valid SqlConnection object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="sourceColumns">An array of string to be assigned as the source columns of the stored procedure parameters</param>
         /// <returns>A valid SqlCommand object</returns>
         public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns) 
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // Create a SqlCommand
             SqlCommand cmd = new SqlCommand( spName, connection );
             cmd.CommandType = CommandType.StoredProcedure;
 
             // If we receive parameter values, we need to figure out where they go
             if ((sourceColumns != null) && (sourceColumns.Length > 0)) 
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
 
                 // Assign the provided source columns to these parameters based on parameter order
                 for (int index=0; index < sourceColumns.Length; index++)
                     commandParameters[index].SourceColumn = sourceColumns[index];
 
                 // Attach the discovered parameters to the SqlCommand object
                 AttachParameters (cmd, commandParameters);
             }
 
             return cmd;
         }
         #endregion
 
         #region ExecuteNonQueryTypedParams
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in 
         /// the connection string using the dataRow column values as the stored procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
         /// </summary>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>An int representing the number of rows affected by the command</returns>
         public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
             
             // If the row has values, the store procedure parameters must be initialized
             if (dataRow != null && dataRow.ItemArray.Length > 0)
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                                 
                 return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection 
         /// using the dataRow column values as the stored procedure's parameters values.  
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
         /// </summary>
         /// <param name="connection">A valid SqlConnection object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>An int representing the number of rows affected by the command</returns>
         public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If the row has values, the store procedure parameters must be initialized
             if (dataRow != null && dataRow.ItemArray.Length > 0)
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                                 
                 return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified
         /// SqlTransaction using the dataRow column values as the stored procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
         /// </summary>
         /// <param name="transaction">A valid SqlTransaction object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>An int representing the number of rows affected by the command</returns>
         public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // Sf the row has values, the store procedure parameters must be initialized
             if (dataRow != null && dataRow.ItemArray.Length > 0)
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                                 
                 return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
             }
         }
         #endregion
 
         #region ExecuteDatasetTypedParams
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
         /// the connection string using the dataRow column values as the stored procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
         /// </summary>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             //If the row has values, the store procedure parameters must be initialized
             if ( dataRow != null && dataRow.ItemArray.Length > 0)
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                 
                 return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
         /// using the dataRow column values as the store procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
         /// </summary>
         /// <param name="connection">A valid SqlConnection object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If the row has values, the store procedure parameters must be initialized
             if( dataRow != null && dataRow.ItemArray.Length > 0)
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                 
                 return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 
         /// using the dataRow column values as the stored procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
         /// </summary>
         /// <param name="transaction">A valid SqlTransaction object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>A dataset containing the resultset generated by the command</returns>
         public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If the row has values, the store procedure parameters must be initialized
             if( dataRow != null && dataRow.ItemArray.Length > 0)
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                 
                 return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
             }
         }
 
         #endregion
 
         #region ExecuteReaderTypedParams
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
         /// the connection string using the dataRow column values as the stored procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
         public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
             
             // If the row has values, the store procedure parameters must be initialized
             if ( dataRow != null && dataRow.ItemArray.Length > 0 )
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                 
                 return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
             }
         }
 
                 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
         /// using the dataRow column values as the stored procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <param name="connection">A valid SqlConnection object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
         public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If the row has values, the store procedure parameters must be initialized
             if( dataRow != null && dataRow.ItemArray.Length > 0)
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                 
                 return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);
             }
         }
         
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 
         /// using the dataRow column values as the stored procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <param name="transaction">A valid SqlTransaction object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
         public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If the row has values, the store procedure parameters must be initialized
             if( dataRow != null && dataRow.ItemArray.Length > 0 )
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                 
                 return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);
             }
         }
         #endregion
 
         #region ExecuteScalarTypedParams
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in 
         /// the connection string using the dataRow column values as the stored procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
         public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
             
             // If the row has values, the store procedure parameters must be initialized
             if( dataRow != null && dataRow.ItemArray.Length > 0)
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                 
                 return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
         /// using the dataRow column values as the stored procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <param name="connection">A valid SqlConnection object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
         public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If the row has values, the store procedure parameters must be initialized
             if( dataRow != null && dataRow.ItemArray.Length > 0)
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                 
                 return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
         /// using the dataRow column values as the stored procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <param name="transaction">A valid SqlTransaction object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
         public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If the row has values, the store procedure parameters must be initialized
             if( dataRow != null && dataRow.ItemArray.Length > 0)
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                 
                 return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
             }
         }
         #endregion
 
         #region ExecuteXmlReaderTypedParams
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
         /// using the dataRow column values as the stored procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <param name="connection">A valid SqlConnection object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>An XmlReader containing the resultset generated by the command</returns>
         public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If the row has values, the store procedure parameters must be initialized
             if( dataRow != null && dataRow.ItemArray.Length > 0)
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                 
                 return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
             }
         }
 
         /// <summary>
         /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 
         /// using the dataRow column values as the stored procedure's parameters values.
         /// This method will query the database to discover the parameters for the 
         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
         /// </summary>
         /// <param name="transaction">A valid SqlTransaction object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
         /// <returns>An XmlReader containing the resultset generated by the command</returns>
         public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
         {
             if( transaction == null ) throw new ArgumentNullException( "transaction" );
             if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             // If the row has values, the store procedure parameters must be initialized
             if( dataRow != null && dataRow.ItemArray.Length > 0)
             {
                 // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
                 
                 // Set the parameters values
                 AssignParameterValues(commandParameters, dataRow);
                 
                 return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
             }
         }
         #endregion
 
     }
 
     /// <summary>
     /// SqlHelperParameterCache provides functions to leverage a static cache of procedure parameters, and the
     /// ability to discover parameters for stored procedures at run-time.
     /// </summary>
     public sealed class SqlHelperParameterCache
     {
         #region private methods, variables, and constructors
 
         //Since this class provides only static methods, make the default constructor private to prevent 
         //instances from being created with "new SqlHelperParameterCache()"
         private SqlHelperParameterCache() {}
 
         private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());
 
         /// <summary>
         /// Resolve at run time the appropriate set of SqlParameters for a stored procedure
         /// </summary>
         /// <param name="connection">A valid SqlConnection object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="includeReturnValueParameter">Whether or not to include their return value parameter</param>
         /// <returns>The parameter array discovered.</returns>
         private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             SqlCommand cmd = new SqlCommand(spName, connection);
             cmd.CommandType = CommandType.StoredProcedure;
 
             connection.Open();
             SqlCommandBuilder.DeriveParameters(cmd);
             connection.Close();
 
             if (!includeReturnValueParameter) 
             {
                 cmd.Parameters.RemoveAt(0);
             }
                 
             SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];
 
             cmd.Parameters.CopyTo(discoveredParameters, 0);
 
             // Init the parameters with a DBNull value
             foreach (SqlParameter discoveredParameter in discoveredParameters)
             {
                 discoveredParameter.Value = DBNull.Value;
             }
             return discoveredParameters;
         }
 
         /// <summary>
         /// Deep copy of cached SqlParameter array
         /// </summary>
         /// <param name="originalParameters"></param>
         /// <returns></returns>
         private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)
         {
             SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];
 
             for (int i = 0, j = originalParameters.Length; i < j; i++)
             {
                 clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();
             }
 
             return clonedParameters;
         }
 
         #endregion private methods, variables, and constructors
 
         #region caching functions
 
         /// <summary>
         /// Add parameter array to the cache
         /// </summary>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <param name="commandParameters">An array of SqlParamters to be cached</param>
         public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );
 
             string hashKey = connectionString + ":" + commandText;
 
             paramCache[hashKey] = commandParameters;
         }
 
         /// <summary>
         /// Retrieve a parameter array from the cache
         /// </summary>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="commandText">The stored procedure name or T-SQL command</param>
         /// <returns>An array of SqlParamters</returns>
         public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );
 
             string hashKey = connectionString + ":" + commandText;
 
             SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];
             if (cachedParameters == null)
             {            
                 return null;
             }
             else
             {
                 return CloneParameters(cachedParameters);
             }
         }
 
         #endregion caching functions
 
         #region Parameter Discovery Functions
 
         /// <summary>
         /// Retrieves the set of SqlParameters appropriate for the stored procedure
         /// </summary>
         /// <remarks>
         /// This method will query the database for this information, and then store it in a cache for future requests.
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <returns>An array of SqlParameters</returns>
         public static SqlParameter[] GetSpParameterSet(string connectionString, string spName)
         {
             return GetSpParameterSet(connectionString, spName, false);
         }
 
         /// <summary>
         /// Retrieves the set of SqlParameters appropriate for the stored procedure
         /// </summary>
         /// <remarks>
         /// This method will query the database for this information, and then store it in a cache for future requests.
         /// </remarks>
         /// <param name="connectionString">A valid connection string for a SqlConnection</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
         /// <returns>An array of SqlParameters</returns>
         public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
         {
             if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             using(SqlConnection connection = new SqlConnection(connectionString))
             {
                 return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
             }
         }
 
         /// <summary>
         /// Retrieves the set of SqlParameters appropriate for the stored procedure
         /// </summary>
         /// <remarks>
         /// This method will query the database for this information, and then store it in a cache for future requests.
         /// </remarks>
         /// <param name="connection">A valid SqlConnection object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <returns>An array of SqlParameters</returns>
         internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)
         {
             return GetSpParameterSet(connection, spName, false);
         }
 
         /// <summary>
         /// Retrieves the set of SqlParameters appropriate for the stored procedure
         /// </summary>
         /// <remarks>
         /// This method will query the database for this information, and then store it in a cache for future requests.
         /// </remarks>
         /// <param name="connection">A valid SqlConnection object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
         /// <returns>An array of SqlParameters</returns>
         internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())
             {
                 return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
             }
         }
 
         /// <summary>
         /// Retrieves the set of SqlParameters appropriate for the stored procedure
         /// </summary>
         /// <param name="connection">A valid SqlConnection object</param>
         /// <param name="spName">The name of the stored procedure</param>
         /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
         /// <returns>An array of SqlParameters</returns>
         private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)
         {
             if( connection == null ) throw new ArgumentNullException( "connection" );
             if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
 
             string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter":"");
 
             SqlParameter[] cachedParameters;
             
             cachedParameters = paramCache[hashKey] as SqlParameter[];
             if (cachedParameters == null)
             {    
                 SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);
                 paramCache[hashKey] = spParameters;
                 cachedParameters = spParameters;
             }
             
             return CloneParameters(cachedParameters);
         }
         
         #endregion Parameter Discovery Functions
 
     }
 }

